CVE-2026-40007 Denial of service in Apache IoTDB
Unauthenticated attackers can cause denial of service via unbounded recursion in the AirGap receiver when enabled, requiring an upgrade to Apache IoTDB.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40007?
CVE-2026-40007 is a high-severity denial of service vulnerability in Apache IoTDB, published on 10 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Uncontrolled Recursion, Uncontrolled Resource Consumption vulnerability in Apache IoTDB. When pipe_air_gap_receiver_enabled=true, the IoTDB AirGap receiver's readLength method calls itself recursively each time it recognises the E-language prefix in socket data, with no depth limit. An unauthenticated attacker can send a stream of repeated E-language prefixes that drives the recursion arbitrarily deep, exhausting the receiver thread's JVM stack and raising StackOverflowError.
This issue affects Apache IoTDB: from 1.0.0 before 2.0.10.
Users are recommended to upgrade to version 2.0.10, which fixes the issue.
Which versions are affected by CVE-2026-40007?
How do I fix CVE-2026-40007?
No fix has been published for CVE-2026-40007 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-40007 being exploited?
There is no known exploitation of CVE-2026-40007 in the wild and no public exploit code.
Sources
Also known as GHSA-4644-hpfg-x44q.